非溃疡性消化不良及慢性非萎缩性胃炎幽门螺杆菌感染4年前后比较
비궤양성소화불량급만성비위축성위염유문라간균감염4년전후비교
Comparison of the Helicobacter pylori infection status and its changing trends during 4 years in non-ulcer dyspepsia and chronic non-atrophic gastritis patients
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